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Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

机译：苯丙氨酸和矿物盐分离的中和渗析。简单理论与实验

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摘要

A simple non-steady state mathematical model is proposed for the process of purification of an amino acid solution from mineral salts by the method of neutralization dialysis (ND), carried out in a circulating hydrodynamic mode. The model takes into account the characteristics of membranes (thickness, exchange capacity and electric conductivity) and solution (concentration and components nature) as well as the solution flow rate in dialyzer compartments. In contrast to the known models, the new model considers a local change in the ion concentration in membranes and the adjacent diffusion layers. In addition, the model takes into consideration the ability of the amino acid to enter the protonation/deprotonation reactions. A comparison of the results of simulations with experimental data allows us to conclude that the model adequately describes the ND of a strong electrolyte (NaCl) and amino acid (phenylalanine) mixture solutions in the case where the diffusion ability of amino acids in membranes is much less, than mineral salts. An example shows the application of the model to predict the fluxes of salt ions through ion exchange membranes as well as pH of the desalination solution at a higher than in experiments flow rate of solutions in ND dialyzer compartments.
机译：提出了一种简单的非稳态数学模型，用于通过循环水动力模式通过中和渗析（ND）方法从无机盐中纯化氨基酸溶液的过程。该模型考虑了膜的特性（厚度，交换容量和电导率）和溶液的特性（浓度和成分性质）以及透析器隔室中的溶液流速。与已知模型相反，新模型考虑了膜和相邻扩散层中离子浓度的局部变化。另外，该模型考虑了氨基酸进入质子化/去质子化反应的能力。将模拟结果与实验数据进行比较，我们可以得出结论，在氨基酸在膜中的扩散能力非常强的情况下，该模型可以充分描述强电解质（NaCl）和氨基酸（苯丙氨酸）混合溶液的ND少于矿物盐。一个示例显示了该模型的应用，该模型用于预测盐离子通过离子交换膜的通量以及脱盐溶液的pH值，其值高于实验中ND透析器隔室中溶液的流量。

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